Variable cross-section cast-in-place box girder support system and construction method

Abstract

The present application relates to box girder construction facility technical field, especially present application relates to variable cross-section cast-in-place box girder support system and construction method, solve the configuration of the support system in the prior art is too complex, resulting in the technical problem of low variable cross-section construction efficiency, the wing foot adjusting mechanism in the technical scheme is as the mechanism for controlling the curvature of the actual box girde wing end, one side of each group of height formwork is arranged with a group of wing foot adjusting mechanism;The height inclined plate and the extension wing plate can be detachably connected on the wing foot adjusting mechanism, the height inclined plate can lap the height formwork, the extension wing plate can lap the wing formwork;And the angle can be preset through modeling matching, avoid many quality control failures in actual construction, and realize variable cross-section disposal, compared with the prior art, not only save time, also simplify the support system, when the steel formwork splicing is completed, the height of the box girder wing end can be changed according to the different preset range, to change the height from the wing end to the platform body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of box girder construction facilities, in particular to a variable cross-section cast-in-place box girder support system and a construction method. BACKGROUND

[0002] In the current mode, variable cross-section continuous box girder is a common bridge form in long-span bridges. When the bridge span is close to 100m or greater than 100m, variable cross-section is used. The cross-section change law has a straight line, a circular arc line, a quadratic parabola, etc. The common one is a quadratic parabola.

[0003] The construction of the variable cross-section continuous box girder is relatively special compared to other ordinary box girders. The ordinary box girder can use a formwork to make a corridor or implement a single cross-section lofting. The variable cross-section needs to be implemented through parameter constraints and multiple corridors, and the steps are relatively complicated. In addition, the existing technology generally focuses on variable height, and the height of the wing is generally not changed. Therefore, the control parameters for the change of the cross-section are the roof thickness, the floor thickness, the box height, and the box girder height, which are the main control parameters.

[0004] With the continuous progress and development of technology, in addition to meeting the traffic requirements of infrastructure, the construction is adapted to local conditions, and the construction obstacles are overcome, so that the construction methods of the variable cross-section cast-in-place box girder are different. The existing disposal method, such as the Chinese invention patent, patent name "Variable cross-section cast-in-place box girder formwork structure and construction method of combined section of flat and longitudinal curve", publication number CN104963290B, aims to provide a construction method which can realize three-dimensional control of the formwork of the combined section of flat and longitudinal curve, ensure uniform stress of the scaffold during concrete pouring, and has outstanding economic and technical benefits.

[0005] However, in fact, the technical solutions in the existing technology all use the box girder height as the main way of variable cross-section. The configuration of the support system in the cited patent is too complex, and the effect of continuous construction is not good. SUMMARY

[0006] The present application aims to solve the technical problem of the existing technology that the configuration of the support system is too complex, resulting in low construction efficiency of the variable cross-section, and provides a variable cross-section cast-in-place box girder support system and a construction method.

[0007] In order to solve the above technical problems, the technical solution of the present application is as follows:

[0008] Firstly, the present application proposes a variable cross-section cast-in-place box girder support system, which comprises:

[0009] a platform body 10 supported by a foundation support assembly 100, so that a first face of the platform body 10 is in a horizontal state, and a second face of the platform body 10 is in a vertical state;

[0010] a horizontal position;

[0011] a box girder prefabricating area 20, which is symmetrically prefabricated with height templates 201 on both sides;

[0012] wing foot adjusting mechanisms 30, one set of which is arranged on one side of each of the height templates 201;

[0013] The wing foot adjusting mechanisms 30 are detachably connected with height inclined plates 301 and extension wing plates 302, the height inclined plates 301 are capable of being lapped with the height templates 201, and the extension wing plates 302 are capable of being lapped with wing templates 202;

[0014] The wing foot adjusting mechanisms 30 are capable of being actuated to change the angle between the height inclined plates 301 and the extension wing plates 302 within a preset range, so that the inclined angle formed by the wing templates 202 and the height templates 201 is within the preset range when being lapped;

[0015] When the steel templates 1 are spliced, the height of the box girder wing end 2 can be changed according to the different preset ranges to change the height of the wing end to the platform body 10.

[0016] Specifically, the wing foot adjusting mechanisms 30 are prefabricated on positioning parts 210;

[0017] Further comprising support frames connected in the horizontal and vertical directions, and the support frames are connected through wrist clasps;

[0018] Longitudinal rods 222 and horizontal rods 221 are erected on both sides of the box girder prefabricating area 20

[0019] Part of the horizontal rods 221 are capable of being connected in the positioning parts 210;

[0020] The positioning parts 210 are fixedly connected above the platform body 10.

[0021] Specifically, the end of the longitudinal rod 222 arranged below the wing template 202 is provided with a support position;

[0022] The support position is provided with an adjusting mechanism 300;

[0023] The adjusting mechanism 300 comprises:

[0024] A threaded sleeve 301a, the first end of which is open and the second end of which is closed;

[0025] A supporting threaded rod 302a, the second end of which is screwed in the threaded sleeve 301a, and the first end of which is connected with an abutting part 303;

[0026] The supporting threaded rod 302a is radially provided with an operating arm 304a;

[0027] A locking sleeve 305a is sleeved on the supporting threaded rod 302a and can be screwed on the outer diameter of the threaded sleeve 301a;

[0028] The locking sleeve 305a is provided with a pressing sheet 306a.

[0029] Specifically, the threaded sleeve 301a includes a plurality of threaded sleeves arranged along the inclined direction of the wing template 202.

[0030] Specifically, a filling block 40 can be installed between the height inclined plate 301 and the extended wing plate 302.

[0031] The wide side of the filling block 40 is connected with a flat plate 401.

[0032] The filling block 40 is provided with a pull ring 402.

[0033] A traction pull rope is connected at one end with the pull ring 402 and at the other end with the node of the support frame 220.

[0034] The traction pull rope can be arranged as multiple inclined traction pull ropes.

[0035] A filling block 410 is used to fill between the height inclined plate 301 and the height template 201 or between the extended wing plate 302 and the wing template 202.

[0036] Specifically, it further includes:

[0037] A wing end template 203 is arranged in parallel with the height template 201.

[0038] The wing end template 203 is fixedly connected with the distal end of the wing template 202.

[0039] The wing end template 203 is fixedly connected with the support frame 220.

[0040] Transverse spreading rods 204 are arranged between the wing end templates 203.

[0041] The transverse spreading rods 204 include multiple transverse spreading rods arranged in parallel along the length direction of the box girder.

[0042] Specifically, the foundation support assembly 100 includes multiple support portions 110 and a main support body 120.

[0043] The support portions 110 are arranged at both sides of the main support body 120.

[0044] The support portions 110 have the same structure as the adjusting mechanism 300.

[0045] The second end of the supporting part 110 is connected to a precast pile 130.

[0046] Specifically, the wing foot adjusting mechanism 30 comprises:

[0047] a main body seat 31, which is detachably fixedly connected above the positioning part 210;

[0048] a vertical main body 32, which is connected above the main body seat 31;

[0049] a first extension main body 33, which is connected perpendicularly to the vertical main body 32 and extends away from the height formwork 201

[0050] in a direction;

[0051] The first extension main body 33 is arranged in parallel with the main body seat 31;

[0052] The main body seat 31, the vertical main body 32 and the first extension main body 33 form an adjusting space 333;

[0053] a second extension main body 34, which is connected to the vertical main body 32 and extends in the direction of the height formwork 201.

[0054] Specifically, the wing foot adjusting mechanism 30 further comprises:

[0055] a guide sleeve 310, which is connected perpendicularly to the first end of the first extension main body 33;

[0056] a first guide rod 311, which is vertically arranged in the guide sleeve 310;

[0057] The first guide rod 311 is rotationally connected to the first end of a first inclined rod 3001;

[0058] The second end of the first guide rod 311 is connected to the output end of a driving cylinder 320;

[0059] The first end of a first short rod 31a is rotationally connected to the center of the first inclined rod 3001, and the second end of the first short rod 31a is rotationally connected to the first end of the vertical main body 32;

[0060] The second end of the first inclined rod 3001 is rotationally connected to the first end of a second inclined rod 3002;

[0061] The second end of the second inclined rod 3002 is rotationally connected to a second short rod 32a;

[0062] The second short rod 32a is rotationally connected to the end of the second extension main body 34;

[0063] The first inclined rod 3001 and the second inclined rod 3002 are provided with a plurality of support parts 330 on the first surface;

[0064] The support parts 330 are used for detachably connecting the height inclined plate 301 or the extension wing plate 302.

[0065] In addition, the technical scheme proposes a construction method of the variable cross-section cast-in-place box girder support system, comprising the following steps:

[0066] Step S1, construction support foundation installation;

[0067] The foundation support installation of the platform body 10 is completed by erecting the main support body 120, and then the prefabricated pile 130 is arranged,

[0068] The directional load support of the platform body 10 is completed by using the support part 110 arranged on the prefabricated pile 130, which plays a role in stabilizing the foundation and uniformly distributing the load;

[0069] According to actual needs, the positions of the prefabricated pile 130 and the support part 110 are adjusted;

[0070] Step S2, erecting the longitudinal rod 222 and the transverse rod 221 on both sides of the box girder prefabrication area 20, and configuring the positioning part 210, and completing the installation of the wing foot adjusting mechanism 30;

[0071] According to the requirement of variable cross-section, the first guide rod 311 is adjusted by driving the driving cylinder 320, the first inclined rod 3001 and the second inclined rod 3002 are driven to realize the change of the inclination of the box girder wing end 2, and finally the extension wing plate 302 and the height inclined plate 301 complete the preset inclination angle, realizing the variable cross-section configuration of the box girder wing end 2;

[0072] Step S3, step S3, filling is completed by using the leveling plate 401 and the filling block 410, at this time the steel formwork 1 is used as a plurality of module units and is matched and positioned with the height formwork 201, the wing part formwork 202, the leveling plate 401, the height inclined plate 301, the extension wing plate 302, and the filling block 410 is completed.

[0073] The configuration of the outer form is completed;

[0074] Step S4, the leveling plate 401 is fastened by the way of tensioning the traction rope, and the configuration of the outer form is completed;

[0075] Before step S4, the wing end formwork 203 and the transverse opening rod 204 are configured and positioned.

[0076] The transverse opening rod 204 is used for hoisting and arranging the core mold.

[0077] The present application has the following beneficial effects:

[0078] The wing foot adjusting mechanism is used as a mechanism for controlling the curvature of the actual box girder wing end, and one side of each group of height forms is arranged with a group of wing foot adjusting mechanisms; the height inclined plate and the extension wing plate can be detachably connected to the wing foot adjusting mechanism, the height inclined plate can be lapped with the height form, and the extension wing plate can be lapped with the wing form; that is, the principle is to change the included angle of the height inclined plate and the extension wing plate in advance through the wing foot adjusting mechanism to achieve this design, which can save a large amount of support, and the angle can be set in advance through modeling matching, avoiding many quality control errors in actual construction, and realizing the treatment of variable cross section; compared with the prior art, not only time is saved, but also the support system is simplified, and finally the wing foot adjusting mechanism can act to change the angle between the height inclined plate and the extension wing plate in a predetermined range, so that the inclination angle formed by the wing form and the height form is within the predetermined range when lapping; after the steel form is spliced, the height of the box girder wing end can be changed according to different predetermined ranges to change the height from the wing end to the platform body. BRIEF DESCRIPTION OF DRAWINGS

[0079] The application will be described in further detail below with reference to the drawings and specific embodiments.

[0080] Figure 1 It is a structural schematic diagram of the application;

[0081] Figure 2 It is a partial enlarged view of the positioning part of the application;

[0082] Figure 3 It is a schematic diagram of the adjusting mechanism of the application;

[0083] Figure 4 It is a schematic diagram of the foundation support assembly of the application;

[0084] Figure 5 It is an embodiment of the use state of the wing foot adjusting mechanism of the application;

[0085] The reference signs in the drawings are as follows:

[0086] Platform body 10, foundation support assembly 100, box girder prefabrication area 20, wing foot adjusting mechanism 30, height form 201;

[0087] Height inclined plate 301, extension wing plate 302, wing form 202;

[0088] Steel form 1, box girder wing end 2;

[0089] Positioning part 210, support frame 220, support frame 220, adjusting mechanism 300;

[0090] Threaded sleeve 301a, support threaded rod 302a, abutment 303a, operating arm 304a, locking sleeve 305a, pressing piece 306a;

[0091] Filler block 40, leveling plate 401, pull ring 402, filler block 410;

[0092] Wing end template 203, transverse distraction rod 204, support part 110, precast pile 130, main support body 120;

[0093] Main body seat 31, vertical main body 32, first extension main body 33, second extension main body 34;

[0094] Guide sleeve 310, first guide rod 311, first inclined rod 3001, second inclined rod 3002, support part 330;

[0095] Wing end template 203, transverse distraction rod 204. DETAILED DESCRIPTION

[0096] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. It should be noted that, in order to facilitate description, in the current view, "left side" is "first end", "right side" is "second end", "upper side" is "first end", and "lower side" is "second end". The purpose of such description is to clearly express the technical solutions, and it should not be understood as an improper limitation on the technical solutions of the present application.

[0097] The present application aims to solve the technical problem of the existing support system configuration being too complex, resulting in low efficiency of variable cross-section construction. The present application provides a variable cross-section cast-in-place box girder support system and a construction method. For details, please refer to Figure 1 , and in combination with the drawings Figures 2-5 , first, the variable cross-section cast-in-place box girder support system comprises: a platform body 10 supported by a foundation support assembly 100, so that the first face of the platform body 10 is at a horizontal position as the foundation for construction. The box girder precasting area 20 can be determined according to requirements. The height template 201 is symmetrically precast on both sides of the box girder precasting area 20. The height template 201 is a positioning template for the height of the box girder. That is, the height template 201 can be pre-customized without changing or modifying the height. The reason is that the present technical solution does not rely on height control to achieve variable cross-section processing.

[0098] The technical scheme designs a wing foot adjusting mechanism 30, the wing foot adjusting mechanism 30 is used as a mechanism for controlling the curvature of the actual box girder wing end 2, one side of each group of height formworks 201 is arranged with one group of wing foot adjusting mechanisms 30; the wing foot adjusting mechanism 30 can detachably connect a height inclined plate 301 and an extension wing plate 302, the height inclined plate 301 can lap the height formwork 201, and the extension wing plate 302 can lap the wing part formwork 202; that is, the principle is to realize the change of the included angle of the height inclined plate 301 and the extension wing plate 302 in advance through the wing foot adjusting mechanism 30, and such a design can save a large amount of support, and the angle can be set in advance through modeling matching, so that many quality control errors in actual construction are avoided, and the variable cross-section treatment is realized, compared with the prior art, not only time is saved, but also the support system is simplified, and finally the wing foot adjusting mechanism 30 can act to change the angle between the height inclined plate 301 and the extension wing plate 302 in a preset range, so that when lapping, the inclined angle formed by the wing part formwork 202 and the height formwork 201 is in the preset range; after the steel formwork 1 is spliced, the height of the box girder wing end 2 can be changed according to different preset ranges to change the height of the wing end to the platform body 10.

[0099] In one specific embodiment, referring to Figure 2 The wing foot adjusting mechanism 30 is prefabricated on the positioning part 210; further comprising: a support frame 220 connected transversely and longitudinally, the support frame 220 is connected through a wrist buckle; longitudinal rods 222 and transverse rods 221 are erected on both sides of the box girder prefabrication area 20, part of the transverse rods 221 can be connected in the positioning part 210; the positioning part 210 is fixedly connected above the platform body 10; the support frame can be built by using the existing scaffold, and the wrist buckle is used as the connection mode of the node, and the configuration of the positioning part 210 can also effectively cooperate with the building of the support frame, increase the connection position, and be more stable and stable, so as to ensure safety.

[0100] In one specific embodiment, referring to Figure 2 , 3 The end of the longitudinal rod 222 arranged below the wing part formwork 202 is provided with a support position; the support position is provided with an adjusting mechanism 300; the adjusting mechanism 300 comprises:

[0101] A threaded sleeve 301a, the first end of which is open, and the second end is closed; a supporting threaded rod 302a, the second end of which is screwed in the threaded sleeve 301a, and the first end is connected with an abutting part 303; the supporting threaded rod 302a is provided with an operating arm 304a in the radial direction; a locking sleeve 305a is sleeved on the supporting threaded rod 302a and can be screwed on the outer diameter of the threaded sleeve 301a; the locking sleeve 305a is provided with a pressing piece 306a; as an auxiliary supporting adjusting mode, the operating arm 304a is easier to operate, and the design of the locking sleeve 305a makes the fastening more stable.

[0102] In one specific embodiment, please refer to Figure 2 As shown, the threaded sleeve 301a includes a plurality of, arranged along the inclined direction of the wing template 202.

[0103] In one specific embodiment, please refer to Figure 4 As shown, a filler block 40 can be installed between the height inclined plate 301 and the extended wing plate 302; the filler block 40 has a flat plate 401 connected to one side of the wide edge; the filler block 40 has a pull ring 402; the traction pull rope, one end of which is connected to the pull ring 402, and the other end is connected to the node of the support frame 220; the traction pull rope can be arranged as an inclined plurality; and the filler block 410 is used to fill between the height inclined plate 301 and the height template 201 or between the extended wing plate 302 and the wing template 202; the traction pull rope can be made of steel wire rope, which is a stable way to fill the filler block 40, further improving the construction precision and safety of the technical solution, and the traction pull rope connected to the node can be arranged in a cable-stayed manner, or a plurality of pull ropes are arranged to form a stable triangular arrangement.

[0104] In one specific embodiment, please refer to Figure 4 , 5 As shown, it also includes: a wing end template 203 arranged in parallel with the height template 201; the wing end template 203 is fixedly connected to the distal end of the wing template 202; the wing end template 203 is fixedly connected to the support frame 220; the wing end template 203 is provided with a transverse opening rod 204; the transverse opening rod 204 includes a plurality of, and is arranged in parallel along the length direction of the box girder; the part of the outer mold mainly involved in the design of the support system of the variable cross-section in this technical solution, and the part of the inner mold can be in the manner of the prior art, which needs to provide a hoisting position, and the design of the transverse opening rod 204 not only can be used as the hoisting position of the inner film part, but also can ensure that the outer mold part is supported and opened to ensure the stability of the steel template 1 before the construction is completed.

[0105] In one specific embodiment, please refer to Figure 4 As shown, the foundation support assembly 100 includes a plurality of support parts 110 and a main support body 120;

[0106] The two sides of the main support body 120 are arranged with the support parts 110; the structure of the support part 110 is the same as that of the adjusting mechanism 300; the second end of the support part 110 is connected to a precast pile 130.

[0107] In one specific embodiment, please refer to Figure 5As shown, the wing foot adjusting mechanism 30 comprises: a main body seat 31 which is detachably fixedly connected above the positioning part 210; a vertical main body 32 which is connected above the main body seat 31; a first extension main body 33 which is vertically connected with the vertical main body 32 and extends away from the height formwork 201; the first extension main body 33 is arranged in parallel with the main body seat 31; the main body seat 31, the vertical main body 32 and the first extension main body 33 form an adjusting space 333; a second extension main body 34 which is connected with the vertical main body 32 and extends towards the height formwork 201.

[0108] The wing foot adjusting mechanism 30 further comprises: a guide sleeve 310 which is vertically connected at a first end of the first extension main body 33; a first guide rod 311 which is vertically arranged in the guide sleeve 310; the first guide rod 311 is rotationally connected with a first end of a first inclined rod 3001;

[0109] A second end of the first guide rod 311 is rotationally connected with an output end of a driving cylinder 320; a second end of a first short rod 31a is rotationally connected with a first end of the vertical main body 32; a first end of the first short rod 31a is rotationally connected at a center of the first inclined rod 3001;

[0110] A second end of the first inclined rod 3001 is rotationally connected with a first end of a second inclined rod 3002; a second end of the second inclined rod 3002 is rotationally connected with a second short rod 32a; the second short rod 32a is rotationally connected at an end of the second extension main body 34; a first surface of the first inclined rod 3001 and the second inclined rod 3002 is provided with a plurality of support parts 330; the support parts 330 are used for detachably connecting the height inclined plate 301 or the extended wing plate 302;

[0111] The driving cylinder 320 is arranged in the adjusting space 333 and is connected with the first guide rod 311; the driving cylinder 320 is used for adjusting the angle between the height inclined plate 301 and the extended wing plate 302; Figure 5 The driving cylinder 320 is arranged in the adjusting space 333 and is connected with the first guide rod 311; the driving cylinder 320 is used for adjusting the angle between the height inclined plate 301 and the extended wing plate 302;

[0112] The construction method of the application of the variable cross-section cast-in-place box girder support system comprises the following steps:

[0113] Step S1, installing a construction support foundation;

[0114] The main support body 120 is erected to complete the foundation support installation of the platform body 10, the precast pile 130 is arranged, and the support part 110 arranged on the precast pile 130 is used to complete the directional load support of the platform body 10, thereby playing a role of stabilizing the foundation and uniformly distributing the load;

[0115] According to the actual needs, adjust the position of the precast pile 130 and the support part 110;

[0116] Step S2, erect the longitudinal rods 222 and the transverse rods 221 on both sides of the box girder precast area 20, configure the positioning part 210, and complete the installation of the wing foot adjusting mechanism 30;

[0117] According to the needs of variable cross-section, adjust the first guide rod 311 by driving the driving cylinder 320, drive the first inclined rod 3001 and the second inclined rod 3002 to realize the change of the inclination of the box girder wing end 2, finally make the extension wing plate 302 and the height inclined plate 301 complete the preset inclination angle, realize the variable cross-section configuration of the box girder wing end 2;

[0118] Step S3, complete the filling by using the leveling plate 401 and the filling block 410, at this time, the steel formwork 1 is used as multiple modules

[0119] The unit cooperates with the height formwork 201, the wing part formwork 202, the leveling plate 401, the height inclined plate 301, and the extension wing plate 302 to complete the configuration of the outer form;

[0120] Positioning, complete the configuration of the outer form;

[0121] Step S4, fasten the leveling plate 401 by the way of pulling the pulling rope tightly, cooperate to complete the configuration of the outer form;

[0122] Among them, before step S4, the wing end formwork 203 and the transverse opening rod 204 are configured and completed, and the overall positioning is carried out

[0123] The transverse opening rod 204 is used for the hoisting and configuration of the core mold.

[0124] Obviously, the above embodiments are only examples for clear illustration, and not limit the embodiments. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A variable cross-section cast-in-place box girder support system, characterized in that, include: Platform body (10), which is supported by basic support components (100), such that the first surface of the platform body (10) is... At a horizontal position; The box girder prefabrication area (20) has height templates (201) symmetrically prefabricated on both sides. Wing foot adjustment mechanism (30), one set of the wing foot adjustment mechanism (30) is arranged on one side of each set of height templates (201); The wing foot adjustment mechanism (30) can be detachably connected to a height ramp (301) and an extension wing plate (302). The height ramp (301) can overlap the height template (201), and the extension wing plate (302) can overlap the wing template (202). The wing foot adjustment mechanism (30) can be activated to change the angle between the height ramp (301) and the extended wing plate (302) within a preset range, so that when overlapping, the tilt angle formed by the wing template (202) and the height template (201) is within the preset range; After the steel formwork (1) is assembled, the height of the box girder wing end (2) can be changed according to the different preset ranges to change the height of the wing end to the platform body (10).

2. The variable cross-section cast-in-place box girder support system as described in claim 1, characterized in that, The wing foot adjustment mechanism (30) is prefabricated on a positioning part (210); It also includes: a support frame that is connected horizontally and vertically, the support frame being connected by a wrist buckle; Longitudinal bars (222) and transverse bars (221) are erected on both sides of the precast box girder area (20). Some of the crossbars (221) can be inserted and connected inside the positioning part (210); The positioning part (210) is fixedly connected to the top of the platform body (10).

3. The variable cross-section cast-in-place box girder support system as described in claim 2, characterized in that, The end of the longitudinal bar (222) arranged below the wing template (202) is provided with a support position; An adjustment mechanism (300) is provided on the support position; The adjustment mechanism (300) includes: A threaded sleeve (301a) has an open first end and a closed second end; The support threaded rod (302a) has its second end screwed into the threaded sleeve (301a), and its first end is connected to an abutment part. （303a）； The supporting threaded rod (302a) is radially provided with an operating arm (304a). A locking sleeve (305a) is fitted onto the supporting threaded rod (302a) and can be screwed onto the outer diameter of the threaded sleeve (301a); A clamping plate (306a) is provided inside the locking sleeve (305a).

4. The variable cross-section cast-in-place box girder support system as described in claim 3, characterized in that, The threaded sleeve (301a) comprises a plurality of them, arranged along the inclined direction of the wing template (202).

5. The variable cross-section cast-in-place box girder support system as described in claim 4, characterized in that, A filler block (40) can be installed between the height ramp (301) and the extension wing plate (302). The filling block (40) is connected to a flat plate (401) on one side of its wide edge. The filler block (40) has a pull ring (402); A traction rope, one end of which is connected to the pull ring (402), and the other end of which is connected to a node on the support frame (220); The traction ropes are arranged in multiple inclined configurations; and Filler block (410) is used to fill between the height ramp (301) and the height template (201) or between the extension wing plate (302) and the wing template (202).

6. The variable cross-section cast-in-place box girder support system as described in claim 5, characterized in that, It also includes: Wing tip template (203), which is arranged parallel to the height template (201); The wing tip template (203) is fixedly connected to the distal end of the wing template (202); The wing end template (203) is fixedly connected to the support frame (220); A transverse support rod (204) is provided between the wing end templates (203); The transverse bracing rods (204) include multiple rods and are arranged parallel to each other along the length of the box girder.

7. The variable cross-section cast-in-place box girder support system as described in claim 6, characterized in that, The basic support assembly (100) includes multiple support sections (110) and a main support body (120). The support portion (110) is arranged at intervals on both sides of the main support body (120). The structure of the support (110) is the same as that of the adjustment mechanism (300); The second end of the support (110) is connected to a precast pile (130).

8. The variable cross-section cast-in-place box girder support system as described in claim 7, characterized in that, The wing foot adjustment mechanism (30) includes: The main body (31) is detachably fixedly connected to the upper part of the positioning part (210); A vertical body (32) is connected above the body base (31); The first extension body (33) is vertically connected to the vertical body (32) and extends away from the height template (201). Extending in the direction; The first extension body (33) is arranged in parallel with the main body base (31); The main body (31), the vertical body (32), and the first extension body (33) form an adjustment space (333). The second extension body (34) is connected to the vertical body (32) and extends towards the height template (201). Extending outwards.

9. The variable cross-section cast-in-place box girder support system as described in claim 8, characterized in that, The wing foot adjustment mechanism (30) also includes: A guide sleeve (310) is vertically connected to the first end of the first extension body (33); The first guide rod (311) is vertically inserted into the guide sleeve (310); The first guide rod (311) is rotatably connected to the first end of a first inclined rod (3001); The second end of the first guide rod (311) is connected to the output end of a drive cylinder (320); The first end of the vertical body (32) is rotatably connected to the second end of the first short rod (31a), the first short rod (31a) The first end is rotatably connected to the center of the first inclined rod (3001); The second end of the first inclined rod (3001) is rotatably connected to the first end of a second inclined rod (3002); The second end of the second inclined rod (3002) is rotatably connected to a second short rod (32a); The second short rod (32a) is rotatably connected to the end of the second extension body (34); The first inclined rod (3001) and the second inclined rod (3002) are provided with a plurality of support parts (330) on their first surfaces. The support (330) is used to detachably connect the height ramp (301) or the extension wing plate (302).

10. The construction method of the variable cross-section cast-in-place box girder support system as described in claim 9, characterized in that, Includes the following steps: Step S1: Installation of construction support foundation; The foundation support installation for the platform body (10) is completed by erecting the main support body (120), and then precast piles (130) are arranged. The support part (110) set on the precast pile (130) is used to support the directional load of the platform body (10), which plays the role of stabilizing the foundation and distributing the load evenly. Adjust the positions of the precast piles (130) and the support structure (110) according to actual needs; Step S2: Install longitudinal bars (222) and transverse bars (221) on both sides of the precast box girder area (20), and configure positioning parts (210), and complete the installation of the wing foot adjustment mechanism (30); According to the requirement of variable cross section, the first guide rod (311) is adjusted by driving the drive cylinder (320), which drives the first tilt rod (3001) and the second tilt rod (3002) to realize the change of the tilt of the box girder wing end (2), and finally the extension wing plate (302) and the height inclined plate (301) complete the preset tilt angle, so as to realize the variable cross section configuration for the box girder wing end (2); Step S3: Filling is completed using flat plate (401) and filling block (410). At this time, the steel formwork (1) is positioned as multiple module units in conjunction with the height formwork (201), wing formwork (202), flat plate (401), height inclined plate (301), and extended wing plate (302) to complete the configuration of the outer formwork. Step S4: Secure the flat plate (401) by pulling it with a traction rope to complete the configuration of the outer mold; Before step S4, the wing end template (203) and the transverse support rod (204) are configured and positioned as a whole; the transverse support rod (204) is used for hoisting the core mold.

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